Hints for Assignment 6

30. Be sure to get an answer that is at least in the ballpark of the actual size of wiring in houses.

31. A hint will be posted if/when someone asks a question about the problem.

32. Think about the direction of current flow on this one. You have an integral to do.

33. This problem can be worked either by analyzing parallel and series combinations or by loop methods. If you have trouble with 34 or 35, you might want to come back to this one and use loop methods for practice.

34. How many loops are there? How many junctions? When you are solving simultaneous equations, it is usually easiest to do your first elimination of variables using the simplest available equations.

35. What is the circuit used to get the effective resistance? Note that this problem can be simplified by using series combination but not finished that way. Loop methods are required. You can save some labor by using symmetry.

36. Use a symbolic-algebra program. If you don't use a package, at least use the junction equations first in eliminating variables.

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Last revised 1998/03/11